private void vibrate(String duration) {
   RhodesApplication.getInstance().vibrate(duration);
 }
 private void play_file(String file_name, String media_type) {
   RhodesApplication.getInstance().play_file(file_name, media_type);
 }
 private void showPopup(String message) {
   RhodesApplication.getInstance().showPopup(message);
 }